From a03f60472d18512b05b4ddab02d8871c81be1c46 Mon Sep 17 00:00:00 2001
From: Patrick LaFontaine <32135464+Pat-Lafon@users.noreply.github.com>
Date: Wed, 27 Sep 2023 17:09:00 -0400
Subject: [PATCH] Small version updates

---
 hashconsing_derive/Cargo.toml |  6 +++---
 hashconsing_derive/src/lib.rs | 17 ++++++++++++-----
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/hashconsing_derive/Cargo.toml b/hashconsing_derive/Cargo.toml
index a671b35..b2cc1e0 100644
--- a/hashconsing_derive/Cargo.toml
+++ b/hashconsing_derive/Cargo.toml
@@ -9,8 +9,8 @@ edition = "2021"
 proc-macro = true
 
 [dependencies]
-darling = "0.14.2"
-proc-macro-error = "1.0.4"
+darling = "0.20"
+proc-macro-error = "1.0"
 proc-macro2 = "1.0"
 quote = "1.0"
-syn = { version = "1.0", features = ["full"] }
+syn = { version = "2.0", features = ["full"] }
diff --git a/hashconsing_derive/src/lib.rs b/hashconsing_derive/src/lib.rs
index fe3a8b4..962e6bc 100644
--- a/hashconsing_derive/src/lib.rs
+++ b/hashconsing_derive/src/lib.rs
@@ -1,12 +1,12 @@
-use darling::{util::Flag, FromMeta, Result};
+use darling::{ast::NestedMeta, util::Flag, Error, FromMeta, Result};
 use proc_macro::{self, TokenStream};
 use proc_macro2::Span;
 use proc_macro_error::{abort_call_site, proc_macro_error};
 use quote::{format_ident, quote};
 use syn::{
-    parse_macro_input, punctuated::Punctuated, token::Paren, AttributeArgs, Data, DataEnum,
-    DeriveInput, Expr, ExprCall, ExprPath, FnArg, Pat, PatIdent, PatType, Path, PathArguments,
-    PathSegment, Token,
+    parse_macro_input, punctuated::Punctuated, token::Paren, Data, DataEnum, DeriveInput, Expr,
+    ExprCall, ExprPath, FnArg, Pat, PatIdent, PatType, Path, PathArguments, PathSegment,
+    Token,
 };
 
 #[derive(Debug, Default, FromMeta)]
@@ -32,7 +32,14 @@ impl MacroArgs {
 #[proc_macro_attribute]
 pub fn hcons(args: TokenStream, mut input: TokenStream) -> TokenStream {
     let parsed_input = input.clone();
-    let attr_args = parse_macro_input!(args as AttributeArgs);
+
+    let attr_args = match NestedMeta::parse_meta_list(args.into()) {
+        Ok(v) => v,
+        Err(e) => {
+            return TokenStream::from(Error::from(e).write_errors());
+        }
+    };
+
     let DeriveInput {
         ident,
         vis,